[Interest] Creating a transparent window that captures mouse events

Jason Kretzer Jason at gocodigo.com
Fri May 16 06:16:45 CEST 2014

Good Day all!

I am trying to create a transparent overlay over an existing QMainWindow.  This is easy to do and I have achieved it in a number of ways while trying to reach my goal.  The problem is not making them transparent, the problem comes in when I want the overlay to capture mouse events — specifically the right double click.

This is with Qt 5.2, on Windows 7 Pro.

The best I have been able to accomplish is to set the overlay opacity to 0.1.  This feels REALLY hacky to me.

The overlay has had many incarnations as I have tried various things — a QLabel with a transparent.png as the pixmap, a QWidget/QMainWindow with setAttribute(Qt::WA_TranslucentBackground), a QWidget/QMainWindow with setStyleSheet("background:transparent;”), a QWidget/QMainWindow/QGraphicsView with the color palette set to Qt::transparent.

I am using an EventFilter to capture the events.  I know it works as when the overlay is opaque, all the proper events fire with nothing getting through.

Anyone know a trick to this?


   Jason R. Kretzer
   Lead Application Developer
   Jason at gocodigo.com

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